Decolorization of Rhodamine-B from Aqueous Solutions by Spent Mushroom Substrate

Jing Liu, Jinghao Shi, Chenxuan Qian, Yubo Zhao, Lihui Chen, Liulian Huang, Xiaolin Luo


The adsorption of Rhodamine-B (Rh-B) from aqueous solutions onto spent mushroom substrate (SMS) and mushroom substrates prior to use (MSP) were comparatively studied in terms of the adsorption parameter effects, isotherms, and kinetics. It was found that an acidic pH of the dye solution was detrimental for basic Rh-B dye adsorption, which favored the electrostatic attraction between the cationic Rh-B and negative SMS and MSP. The adsorption isotherms of Rh-B onto the SMS and MSP followed the Langmuir model rather than the Freundlich or Temkin models. The fitted adsorption capacity of the SMS (107.5 mg/g) was approximately double that of the MSP (47.6 mg/g), which indicated a higher surface area and the presence of more adsorption functional sites that were created during edible fungus (Grifola frondosa) cultivation. Moreover, the experimental adsorption data of the SMS and MSP obeyed pseudo-second-order kinetics. The intraparticle diffusion plots revealed the multilinear adsorption nature of the SMS, which included boundary layer adsorption, intraparticle diffusion, and pore diffusion. However, only intraparticle diffusion played a major role in the adsorption of Rh-B onto MSP. It was concluded that the utilization of agricultural waste for edible fungus cultivation would not only improve the value of the agricultural waste itself, but can also remove Rh-B from aqueous solutions.


Spent mushroom substrate (SMS); Mushroom substrates prior to use (MSP); Rhodamine-B (Rh-B); Adsorption; Isotherm; Kinetics

Full Text: PDF

Welcome to BioResources! This online, peer-reviewed journal is devoted to the science and engineering of biomaterials and chemicals from lignocellulosic sources for new end uses and new capabilities. The editors of BioResources would be very happy to assist you during the process of submitting or reviewing articles. Please note that logging in is required in order to submit or review articles. Martin A. Hubbe, (919) 513-3022,; Lucian A. Lucia, (919) 515-7707, URLs:; ISSN: 1930-2126